sibo-playground/code/inventory/scan.c

/*
 * scan.c - Phase 1 barcode diagnostic: pin down the BAR: device.
 *
 * The scan key is keycode 368 (a Window Server key event an app catches to
 * trigger a scan); the working demo draws the decode itself, so it uses a
 * scanner API - and the only barcode software path in this SDK is the bar*.ldd
 * decoder device "BAR:". Our BAR: open has been failing but its exact error
 * kept scrolling away. This build loads BAREAN, opens BAR:A (then BAR:B),
 * reports each result and HOLDS the screen. If a channel opens, it issues
 * p_iow(P_FREAD) - which should arm the laser - and dumps the decode.
 */
#include <plib.h>
#include "bcode.h"

GLDEF_C INT main(VOID)
{
    VOID *chan;
    UBYTE buf[256];
    INT   ld, ra, rb, r, i, cnt;

    ld = p_loadldd(BCODE_LDD);
    ra = p_open(&chan, "BAR:A", (UINT)-1);
    if (ra < 0)
        rb = p_open(&chan, "BAR:B", (UINT)-1);
    else
        rb = 0;

    p_printf("load %s: %d\n", BCODE_LDD, ld);
    p_printf("open BAR:A: %d\n", ra);
    if (ra < 0)
        p_printf("open BAR:B: %d\n", rb);

    if (ra < 0 && rb < 0) {
        p_printf("\nNo BAR channel opened. Press a key.\n");
        p_getch();
        return 1;
    }

    p_printf("\nOpen. A read should arm the laser - scan now.\n\n");
    for (;;) {
        r = p_iow(chan, P_FREAD, buf);   /* arms laser, blocks for a decode */
        if (r < 0) {
            p_printf("read status %d\n", r);
            continue;
        }
        cnt = buf[0];
        if (cnt <= 0) {
            p_printf("(empty read)\n");
            continue;
        }
        p_printf("cnt=%d type=%d:", cnt, buf[1]);
        for (i = 1; i <= cnt && i < 256; i++)
            p_printf(" %d", buf[i]);
        p_printf("  \"");
        for (i = 1; i <= cnt && i < 256; i++)
            p_putch(buf[i] >= ' ' ? buf[i] : '.');
        p_printf("\"\n");
    }
}